gcc/testsuite/gcc.dg/tree-ssa/pta-ptrarith-2.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fno-tree-forwprop -fno-tree-ccp -fdump-tree-ealias" } */
   3
   4 extern void abort (void);
   5 struct X {
   6   int *p;
   7   int *q;
   8   int *r;
   9 };
  10 int __attribute__((noinline))
  11 foo(int i, int j, int k, int off)
  12 {
  13   struct X x;
  14   int **p, *q;
  15   x.p = &i;
  16   x.q = &j;
  17   x.r = &k;
  18   p = &x.q;
  19   p -= 1;
  20   /* *p points to { i } */
  21   q = *p;
  22   return *q;
  23 }
  24
  25 /* { dg-final { scan-tree-dump "q_. = { i }" "ealias" } } */